luapackageloader – Allow LuaTeX to load external Lua packages

This pack­age al­lows LuaTeX to load pack­ages from the de­fault
pack­age.path and pack­age.cpath lo­ca­tions.
This could be use­ful to load ex­ter­nal Lua mod­ules, in­clud­ing
mod­ules in­stalled via LuaRocks.